
Document IIF
Évaluation numérique des performances thermiques d’un échangeur de chaleur terre-air proche de la surface sous une couverture végétale courte : étude paramétrique.
Numerical evaluation of the thermal performance of a near-surface earth-to-air heat exchanger with short-grass ground cover: A parametric study.
Résumé
High energy consumption and increasing energy cost have encouraged investment in energy efficiency. In hot areas, like the Middle East, the share of space cooling accounts for most of the total energy use in buildings. Earth-to-air heat exchangers represent an energy-efficient and environmentally friendly cooling technique. An earth-to-air heat exchanger buried near the ground surface with short-grass cover, which lowers the soil temperature by evapotranspiration, is an alternative to conventional deep buried types. In this study, a steady three-dimensional numerical model of this earth-to-air heat exchanger was developed by considering the conservation of mass, momentum, energy, and species. Soil temperature and moisture content measurements were used as boundary conditions for the model. In addition, the variations of soil temperature and thermal conductivity with depth were considered in the model. Numerical predictions of temperature matched experimental measurements within ±0.5 °C. Using the validated numerical model, the effect of inlet air temperature, airflow rate, tube length, material, wall thickness, and soil thermal conductivity on the earth-to-air heat exchanger thermal performance was investigated. Increasing the airflow rate and tube length resulted in an asymptotic increase and decrease in the earth-to-air heat exchanger outlet temperature, respectively. By increasing the tube wall thickness from 1 to 10 mm, the outlet temperature for an aluminum tube remained unchanged, while for PE and PVC tubes, the outlet temperature increased by about 1.1 and 2.2 °C, respectively. By increasing the soil thermal conductivity from 1 to 5 W m−1 K−1 the outlet temperature decreased by about 4.4 °C.
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Détails
- Titre original : Numerical evaluation of the thermal performance of a near-surface earth-to-air heat exchanger with short-grass ground cover: A parametric study.
- Identifiant de la fiche : 30028257
- Langues : Anglais
- Sujet : Technologie
- Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 125
- Date d'édition : 05/2021
- DOI : http://dx.doi.org/10.1016/j.ijrefrig.2020.12.034
- Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.
Liens
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Indexation
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Thèmes :
Evaporateurs, condenseurs et autres échangeurs thermiques;
Conditionnement d'air pour le confort;
Mesures thermodynamiques - Mots-clés : Échangeur de chaleur; Refroidissement passif; Sol-air; CFD; Experimentation; Modélisation; Climat chaud; Conductivité thermique; Sol; Simulation; Qatar; Étude de cas
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Parametric optimization of earth-air heat excha...
- Auteurs : HEGAZI A. A., ABDELREHIM O., KHATER A.
- Date : 09/2021
- Langues : Anglais
- Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 129
- Formats : PDF
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Heat transfer analysis of double U-tube ground ...
- Auteurs : KUMAR S., PANDIT J., MURUGESAN K.
- Date : 24/08/2019
- Langues : Anglais
- Source : Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
- Formats : PDF
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Características del subsuelo y perfiles de temp...
- Auteurs : VIDAL A., CHÁVEZ J., LUMBRERAS J. A., et al.
- Date : 22/02/2012
- Langues : Espagnol
- Source : CYTEF 2012. VI Congreso Ibérico y IV Congreso Iberoamericano de Ciencias y Técnicas del Frío, Madrid, España, 22-24 de febrero, 2012.
- Formats : PDF
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Solar-powered mechanical subcooling refrigerati...
- Auteurs : BARGHASH S., BAHMAN A., IBRAHIM O. M.
- Date : 05/2021
- Langues : Anglais
- Source : 2021 Purdue Conferences. 18th International Refrigeration and Air-Conditioning Conference at Purdue.
- Formats : PDF
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Effect of ambient conditions in Kuwait on the p...
- Auteurs : WALY M., CHAKROUN W., MUTAWA N. K. al-
- Date : 21/11/2005
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- Source : ICERD-3. Third International Conference on Energy Research and Development [2 volumes + CD-ROM].
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